All sources and object libraries of png and zlib libraries are available in [.SRC] directory into PNG081.ZIP file. You can extract them with UNZIP utility. Files needed for compiling and linking: PNG.H LIBPNG.OLB (GCC 2.5.8 on VAX/VMS 5.5-2) LIBPNG.OLB_DECC (DEC C 5.0 on VAX/VMS 6.1) LIBPNG.OLB_AXP (DEC C 5.0 on Alpha/VMS 6.1) ==> you may need GCCLIB.OLB for linking when using the GCC version of PNG on VAX. ZCONF.H ZLIB.H LIBGZ.OLB (VAX C 3.2 on VAX/VMS 5.5-2) LIBGZ.OLB_DECC (DEC C 5.0 on VAX/VMS 6.1) LIBGZ.OLB_AXP (DEC C 5.0 on Alpha/VMS 6.1) Patrick MOREAU - CENA/AThis-Mons - FRANCE pmoreau@cena.dgac.fr moreau_p@decus.decus.fr